Electrical choke-coil.



PATBNTED AUG. 3,\1`904.

G. S. CARSON. ELECTRICAL CHOKE COIL.

APPLICATION FILED MA1-1.30, 1904.

`N0 MODEL.

witneoow Patented August 30, 1904.

PATENT OEETCE.

GEORGE S. CARSON, OF IOIVA CITY, IOIVA.

ELECTRICAL (.)HOKE--COIL SPECIFICATION forming part of Letters PatentNo. 769,057, dated August 30, 1904.

Application led March 30, 1904.

To @ZZ 107210711, it may concern,.-

Be it known that I, GEORGE S. CARSON, of Iowa City, in the county ofJohnson and State of Iowa, have invented certain new and usefulImprovements in Electrical Choke-Coils; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

' The object of this invention is to so arrange a choke-coil inreference to an electric linewire and a lightning-arrester that thedynamocurrent will follow the coil, while the static current will not,but will be forced to make its escape along the lines of leastresistance.

A further Objectis to so construct the chokecoil that it may form partof the line-wire and Abe wholly supported thereby.

rIhe invention will be hereinafter fully set forth, and particularlypointed out in the claims.

In the accompanying' drawings, Figurel is a view in side elevation of myimproved chokecoil. Fig. 2is a central longitudinal sectional view. Fig.3 is a diagrammatic view showing the location of a coil andlightningarrester relatively to a line-wire.

Referring to the drawings, l designates the choke-coil in its entirety;2, the line-wire, wherein the coil forms a part; 8, a lightningarrester,(indicated only in outline in Fig. 3,) and 4 the ground-wire thereof.

The choke-coil consists of a tube 5, of porcelain or othernon-conducting ireproof material, around which is closely wound coils ofinsulated wire 6, and a core 7, of softiron, eX- tended longitudinallythrough the tube and having at its ends yokes 8, wherein are mountedporcelain knobs 9, around which the ends of the coil-wire are wound. Thecoil-wire is covered with the best rubber or gutta-percha insulation, soas to prevent the static current from jumping' from oneconvolution toanother. rIhe conjunctive parts of the wire coilnamely, the soft-ironrod and the porcelain knobsconstitute a positive Adirect connection forthe line-wire and a support for the tube whereon the coil is wound. Thechoke-coil is secured direct to and made a Serial No. 200,843. (Nomodel.)

part of the line-wire, thus placing the choke in circuit with theline-wire. Thelightningarrester is connected to the line-wire injuxtaposition to the choke-coil by a wire l0.

My improved choke-coil is constructed on the principle that thedynamo-currents will follow the coil, while the static current will not,the latter being forced by the coil to make its escape along the line ofleast resistance, which is through wire lO to the arrester and thence tothe ground. The coil may be used in connection with any well-known formsof lightning-arresters which are adapted to thc voltage of the line uponwhich the coil and arrester are installed. The coil is adapted forout-of-door use on electric, telephone, telegraph, or other line wiresupon which the lightning-current is damaging. It is intended to placethe coils at frequent intervals on the Y line-wire, and thus prevent thelightning-current from extending the whole length of the wire bydiverting it to the arresters. The coils may be used without regard tothe weather and can be placed indoors or outdoors, as the circumstancesmay require.

From what has been said it will be seen that the choke-coils being fullyinsulated from the iron core the electric current will be forced throughthe coil and prevented from taking the shorter path across the directconnection established by the iron core and also that the coil beingattached in the body of the line becomes a part thereof, and inconsequence lightning-currents of electricity will be readily divertedfrom the line-wires to the arresters, and thus prevented from followingthe lines to their ends.

I claim as my inventioni l. In combination with an electric line-wire,and a lightning-arrester, a choke-coil located in juxtaposition to theconnection between the arrester and the wire, said chokecoil formingpart of the said line-wire, and a direct connection between thoseportions of the linewire at each end of the choke-coil.

2. In combination with an electric line-wire, and a lightning-arrester,al choke-coil located in juxtaposition to the connection between thearrester and the wire, said choke --coil forming part of the saidline-Wire, and comprising a coil of insulated Wire and a supporttherefor around which such coil is Wound, said support being itselt`supported by the line-Wire.

3. The herein-described choke-coil comprising a coil of insulated Wire,a tube of insulating material around Which such coil is Wound, an ironcore extended through said tube, and blocks of insulation supported bysaid core at its ends and around Which the ends of said coil are passed.

4. The herein-described choke-coil comprising a coil of insulated Wire,a tube of insulating material around Which such coil is Wound, an ironcore extended through said tube, and having yoke-like ends, and blocksof insula- In testimony whereof I have signed thisr speciiication in thepresence of two subscribing Witnesses.

GEORGE S. CARSON.

Witnesses:

CHARLES M. DUTCHER LAURA SCHULZE.

